The Universal Language Selector extension (ULS) provides a flexible way to configure and deliver language settings like interface language, fonts, and input methods (keyboard mappings). This will allow users to type text in different languages not directly supported by their keyboard, read content in a script for which fonts are not available locally, or customize the language in which menus are displayed.

This functionality was partially provided by Narayam and WebFonts Extensions on some wikis. The ULS replaces those extensions and will be available in all Wikimedia projects for all users (logged-in and anonymous). More project specific details later.

The functionality provided is listed below:

Language settings panel. Main entry point to configure language tools. It can be accessed from the inter-language list on the sidebar, or at the personal toolbar for wikis lacking inter-language links.

User interface language adjustments. User can change the language in which the UI is provided regardless of the content language. At the moment, UI customization is only provided for logged-in users.

Font selection. Web fonts are provided for non-latin scripts so that users can display content in those languages without installing local fonts. Users can select alternative fonts or decide to use their local fonts if they are available.

Input method configuration. Users lacking a keyboard for a particular script can still write in that script by using input mappings. Hindi users with a QWERTY keyboard can write “प” by typing “pa” when Hindi input method is enabled.

Input method contextual menu. Options for switching between languages and keyboard mappings are provided next to each active input element. Users can easily combine English, International Phonetic Alphabet and Russian when writing about Moscow on English Wikipedia: “Moscow (/ˈmɒskaʊ/ or /ˈmɒskoʊ/; Russian: Москва, tr. Moskva; IPA: [mɐˈskva]) is the capital city and the most populous federal subject of Russia.”

Language settings allow a registered user accessing English Wikipedia to change the UI to his native language.

A Bengali user is able to read content from the Bengali Wikipedia despite the lack of fonts in his computer. Web fonts are provided automatically for non-latin scripts for which an open source font is available. The user can decide to use their system fonts on a per language basis.

A Hindi speaker without a Hindi keyboard configures input methods so that he can type in his language.

One can use ULS "अक्षरांतरण" (Transliteration) or "मराठी लिपी" (Inscript) typing options to search or edit Marathi Wikipedia articles as shown in this video clip example; One can click on the 'cc to change the subtitle languages to Marathi, English, Sanskrit, Kokani, Ahirani languages.In simmiller way other languages can be selected.